This documentation is for people who have already setup their Office 365 multi-factor authentication (MFA) setup, but want to change their authentication method to Push using the Microsoft Authenticator app.
To setup the Microsoft Authenticator app
Begin by downloading the “Microsoft Authenticator app” for your MFA device (Android or iOS).
Go to: https://aka.ms/MFASetup
You will be prompted to login with your normal email and password login information.
Then MFA method you had setup (phone call or texted code).
Once logged in, click “Add security info”.
Choose “Authenticator App”.
You will be asked to download and install the Microsoft Authenticator app on your mobile device.
Click Next, and choose “Work or School Account”
Click the + button in the center of the screen to add your account.
You need to allow permissions to your camera to scan the QR code.
Point the camera at the QR code. Tap Finish on your mobile device.
On the website, click Next and approve the authentication on your mobile device. Click Done.
To change the default MFA method to Authenticator app notification.
Now, when you log in from an MFA required location you should only have to approve or deny the login instead of having to receive a phone call or enter a code. This method is also more secure than the other methods.
Microsoft also has documentation on how to manage your MFA login here:
https://docs.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-manage-settings
If you need further assistance, please place a ticket here: I Need Help , or call the call the IT Service Desk at (585) 395-5151 Option 1.